Unfortunately, no there isn't a direct way. The SKU is tied to the app service plan and since it returns Microsoft.Web/serverfarms, there isn't any relevant data about what apps are associated to that plan.
If you want to go to the CLI route, you'll have to create a script that returns what you need into a variable e.g. $plans = az appservice plan list --resource-group myresourcegroup --query "[].{Id:id, Name:name, Sku:sku.name}" --output table
To get your list of app service plans. Next you'll need iterate of over $plans
passing id as parameter for query e.g. az webapp list --resource-group myresourcegroup --query "[?appServicePlanId=='<<$plan.id>>']
Regards,
Ryan